182 



TRANSACTIONS OF THE ILLINOIS 



Explanation of Fig. 3. — a, shows a healthy root ; b, one on which the lice are 

 working, representing the knots and swellings caused by their punctures ; c, a root that 

 has been deserted by them, and where the rootlets have commenced to decay ; d, d, d, 

 shows how the lice are found on the larger roots ; c, female pupa, dorsal view ; f, same, 

 ventral view ; g, winged female, dorsal view ; //, same, ventral view ; i, greatly mag- 

 nified antenna of winged insect ; j, side view of the wingless female, laying eggs on 

 roots; k, shows how the punctures of the lice cause the larger roots to rot. 



To conclude : We have had an insect on our American continent, 

 which I have been able to trace as far back as 1834, in San Antonio, 

 Texas, and also in 1845, gathered in Kansas. The efforts to cultivate 

 the European vine have failed of success. 



